Revert "Add animated webp images to DM testing"

This reverts commit 6ecc373cde276ecf19d9599f7502b79ebf575936.

Reason for revert: skbug.com/6682

Original change's description:
> Add animated webp images to DM testing
> 
> Change-Id: Idb6f95574136cbcb4fb45784a5bf1db3fa97ab32
> Reviewed-on: https://skia-review.googlesource.com/17832
> Reviewed-by: Matt Sarett <msarett@google.com>
> Commit-Queue: Leon Scroggins <scroggo@google.com>
> 

TBR=borenet@google.com,msarett@google.com,scroggo@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I6674dbb66a24e425b3432309a8f37e19cf484d48
Reviewed-on: https://skia-review.googlesource.com/17846
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
2 files changed